[Bug 1483742] Re: do-release-upgrade 12.04 fails

[Paul Marxhausen]

OK, I find a couple other people had this problem, and bug #1357566
seems to be pretty much the same.  A contributor writes that he resolved
this by removing libkrb5-3 and then the upgrade went smoothly.

I remember fighting with libkrb53 and libkrb5-3 when I updated to 12.04,
because openssh-server was not working correctly.  It's been too long
and I don't remember but I THINK I had to remove libkrb53 and install
libkrb5-3 to make openssh-server happy.

So it's not just Postgres that takes a hit from removing this.  I'm not
going to try removing libkrb5-3 and rerunning things just yet until I
can do some more homework - maybe some testing on another server to see
if I can remove it, run an upgrade, and then reinstall it.

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https://bugs.launchpad.net/bugs/1483742

Title:
  do-release-upgrade 12.04 fails

Status in update-manager package in Ubuntu:
  New

Bug description:
  Stable, well maintained, plain-vanilla 12.04 web server failed the
  "do-release-upgrade" procedure to 14.04 while calculating the
  differences.  Message  "An unresolvable problem occurred while
  calculating the upgrade.

  This can be caused by:
  * Upgrading to a pre-release version of Ubuntu
  * Running the current pre-release version of Ubuntu
  * Unofficial software packages not provided by Ubuntu

  If none of this applies, then report this bug using the 
  command "ubuntu-bug ubuntu-release-upgrader-core""

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager (not installed)
  ProcVersionSignature: Ubuntu 3.2.0-39.62-generic 3.2.39
  Uname: Linux 3.2.0-39-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.9
  Architecture: amd64
  Date: Tue Aug 11 08:19:07 2015
  MarkForUpload: True
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=POSIX
   SHELL=/bin/bash
  SourcePackage: update-manager
  Symptom: ubuntu-release-upgrader-core
  UpgradeStatus: Upgraded to precise on 2015-08-11 (0 days ago)

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